The royals were visiting the powerful art installation, called "Blood Swept Lands And Seas Of Red," which paid tribute to those killed in the First World War.

Kate's beautiful frock, a nod towards the peace that was broken when the war began, featured a pleated detail on the bust and half-length sleeves. The duchess paired the simple but elegant dress with black pumps and a matching clutch.

So far 120,000 poppies have been planted, and by the time it's finished, there will be 888,246, representing the number of British and Commonwealth servicemen and women killed during the First World War.